Asked by: AMOL
Subject: PHYSICS
Question: WHAT IS MISTRY BEHIND BLACK HOLE?
AND HOW CAN CALCULATE ITS GRAVITY?
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Visitor Ip: 61.17.247.171
if a star whose mass is atleast 10-15 times the solar mass ,undergoes supernova explosion,then it will leave a massive remnant.by now all the nuclear fuel is exhausted and nuclear reactions are stoped,therefore there is no outward force to oppose gravitational force and as a result the stellar remnant will collapse on itself i.e. contaction starts and a stage is reached when it becomes a point of zero volume and infinte density,because of infinite density no light escapes because emitted photons are trapped in to a orbit by intense gravitational field &there4appears black. as nothing can escape from black hole therefore escape velocity is infinite and from the formula of escape velocity we can conclude that gravity is also infinite.
When the radius of the stars become denser and denser the attractive force increases.......
no photon can ever leave the star
Schwarzschild radius
Rs = {(2GM)/c*c}